Recipe taken from here

This works well with the Chocolate Cake Recipe

Ingredients

  • 3 sticks (339 g) unsalted butter
  • 84g cocoa powder
  • 568g (!) powdered sugar
  • 1/2 cup milk
  • 2 tsp vanilla extract

Steps

  • Cream butter & cocoa powder in a stand mixer
  • Slowly add in powdered sugar and milk, continuing to mix
  • Add vanilla extract